import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet("/postParameter")
public class PostParameter extends HttpServlet {

    //  这个事例是为了演示如何获取 POST请求中的参数
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType("text/html; charset=utf-8");
        String userId = req.getParameter("userId");
        String classId = req.getParameter("classId");

        resp.getWriter().write("userId: "+userId+", "+"classId" + classId);

    }
}
